[issue2521] ABC caches should use weak refs

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

bluag: the script you run contains a list of some modules required to start Python
(I found a copy here: https://github.com/pinax/pinax/raw/master/scripts/pinax-boot.py )
This script is obviously out of date wrt the new version of Python. Please report this to the pinax project!

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